Continuous tunnel kiln



. Feb. 19, 1924.; 1,484,118"

' C DRESSLER CONTINUOUSYTUNNEL KILN Original Filed Feb 21. .1920

INVENTUR ATTORNEY BY I 2/ Patented Feb. 19, 1924.

CONRAD DBFSSLEBQEOF CLEVELAND, OHIO, AssIs-Noa fro AMERICAN DRESSLER TUN- mu. KILNS, me, on NEW YORK, N. Y., A ooaroanrroiv on NEW YORK H r :1 f orr cz.

con'rinuous 'rUivNEnru N.

' Original application filed February 21, 1920, Serial .Nol 360,505. Divided'and this application filed August 31, 1921 Serial No. 407,116. Renewed November 14, 1923'.

To all whom it. may 015mm.-

Be itknown'that I, CONRAD-.DRESSLER, a

I citizen of the United States, and resident of v Cleveland, in, the county o'f Cuyahoga'and- '5 State of Ohio,hayej invented vcertain new-J and useful Improvements in Continuous Tunnel Kilns; -o f,which .the following is a specification. i 1' The general object of the igpresent inven- -.tionis to provide means for heating, and controlling the temperature in a continuous tunnel kiln.

The various features" of novelty which characterize my invention are pointed out 5 with particularity in the claims annexed "to, and forminga part. of this "specification.

' For a better understanding of the invention however, the advantages possessed by it and .specific' objects attained with its use, reference should be hadfto the accompanying llSQOf my present invention in an open fire tunnel kiln especially devised for drying andburning brick and comprising a drying chamber B in alignment with, and forming a direct extension of the kiln proper. The brick carrying cars A enter the drying chamber B at the entrance end B of the dryingchamber, and pass first through the drying chamber and then through the kiln chamber properaon track rail ..D which run from the entrance end B of the drying chamber to the exit end C of the kiln. In-

passing through the finaL-or coolingzone section of the kiln chamber, the'bricks are cooled by atmospheric air drawn in through the end C of the-kiln chamber which may be leftopen or be provided with suitable openings for the admission of this air. The air thus-admitted to the cooling zone section of the kiln is withdrawn at intervals along the length of the cooling zone section through orts C and "downcomer passages C 'Elhe portion of the kiln 1 I have illustratedand described preferred chan iber above the path-way for the goods in the, cooling'. zone sect'ion, is"

'jdivided by transverse partitions or barriers Cinto a. series of-compartments open at their lower end. The partitions orbarriers C extend into close proximitywith the. up

per ends of the stacks of brick onithe cars A. The downcomerpassages C v are formed inthe side walls of the kiln chamber and areaconnected at their upper ..end' s' to the roof com artment between the'partlt-ions C nearest; 0 .the furn'ace; zone of the kiln.

Each of the other roof com artments is;

connected by a pair-of ports I? tof con'duits E running along the top of thejkilnjcham ber. The downcomer passages C are connected at their lower ends to horizontal tunnels or conduits .0 arranged one at eachdischarge ip'e s'F into the adjacent ends of' the'con uits C As shown, each of the blower pipes'F terminates in a horizontal nozzle portion F which discharge an axial jet into the'corresponding tunnel C and' thereby exerts the suction 'efl'ect onthe lowor end of the; corresponding. downcomer I passages C necessary'to create the;des1red.- I

flow downward through'the passage C;

At intervals. along the length of the high temperature or furnace zone of the kiln, burner chambers Gnare' provided -in the side walls of the'kiln. These receive air from the passagesC, each throu h a corresponding branch passage G from a corresponding gas supp passage I chamber' Greceivesfuel gas through a supply connection I, controlled bir a valve I of which -there is one at eachside of the kiln. The gassupply passages 1 are connected toa gassupplyi source I which may be agas holder or a-gas roducer.

Each burner chamber terior kiln chamber through a burner nozzle H advantageously formed of carborundu'm or other highly refractory material and: tapered and disposed so that theburning jet delivered by it into the kiln chamber is inclined toward the entrance end B of the dryin chamberlan d, isatthe level of passages preferably formed at the tops of the cars The passages A are open at their upper sides to the interstices in the stacks of brick-mounted on the cars,

opens to the inmay be formed 1n.the permanent portions;

- of the car bodies, or in the'bottoms of the brick stacks, are arranged herring-bone fashion with each passage inclined vto the direction oftravel of the cars so as to be parallel to the direction of the jets discharged by the corresponding set of burnernozzles H. j

In the normal intended operation of'the apparatus disclosed, a portion only of the heated air received-by the pipes E through the ports Chis withdrawn from the pipes by I the'blowers F, and utilized in supporting combustion in the burner chambers G. The remainder of the air entering the pipes E is-withdrawn from the latter by blowers J,

and is passedfrom the latter into the drying chamber B through'piping J The products of combustion are drawn-from the furnace zone of the kiln longitudinally through the kilnchamber by a suitable" draft creating device shown as comprising. anexhauster K with its outlet connected to a discharge stack K Preferablythe roducts J tunnel kiln having fuel burning PIOVlSlOll v of combustion are utilized to impar heat to the drying chamber B without coming into direct co'ntact'With the bricks or other. goods to be dried, but'the manner in which this is accomplished and the specific construction ofthedryin g chamber B and of the portion of the kiln between the drying chamber and the furnace zone of the kil n need not be illustrated and described herein as they form no part of the present invention and I q are fully disclosed and claimed in my application for patent, Serial No. 360,505, filed February 20, 1920,0f which this application is a division.

The carborundum burner nozzles H form effectiveand durable means for giving the desired velocity and direction to the I burning jets entering the kiln chamber through them. The provisions described for withdrawing air fromthe cooling zone section of the kiln and delivering it to the' combustion-chambers G' insures an adequate supply of highly heated air to the combus tion' chambers without subjecting the air moving blowers or fans F to the injurious action of the'most highly heated air withdrawn from the entrance end of the cooling zone section by the downcom'er passages C -While in accordance-with the provisions of the statutes, I have illustrated and described the best form of my invention now known to me, it wil1 be apparent to those skilled in the art that changes may be made -inthe form of theapparatus disclosed without departing from the spirit of my invenf of Aug. A. D. 1920.

tion as set forth in the appended claims, and that in some cases certain features of my invention may be used to advantage without 'a corresponding use of other features.

Having now described my invention, what I claim as new-and desire tosecure by Letsaid burner chambers, and nozzle members formed of carbo'rundum and connecting said burner chambers to the interior of the kiln chamber; 4 i j g 2. In acontinuous tunnel kiln, the combination' with a kiln chamber having side walls formed with burnerl chambers therein, of provision for supplying air and fuel to said burner chambers, and nozzle members formed of carborundum .andhaving tapered nozzle orifices. which connect .said burner chambers to the interior of the ln'ln cham-.

ber.

,3. The combination with a continuous for heating a high temperature portion of the kiln and means for creating a flow of v air vthrough a portion of the kiln adjacent,

its exit end to cool the goods passing through said portion, and means for with drawing the said air from the kiln and de- I livering it to said fuel burning portion, said last mentioned means comprlsmg air outlet.

ports distributed along the length of the kiln, a fan drawingair through some of said outlets adjacent the exit end'of thekiln and discharging this air in a jet, and means for utilizing said jet to create a suction drawing air through one of said outlets more remote from the exit end of the kiln.

4. The combination witha. continuous tunnel kiln having fuel-burning provision for heating a high temperature portion of the kiln and means for creatin the flow of air through a second portion 0 the kiln ad-v jacent its exit end to cool the goods passing through said portion, of means for w1thdrawing the air from the kiln, comprising i a fan drawing air from a part of said second kiln portion more closely adjacent the exit' end of the kiln and for discharging this air in a jet, and means for utilizing said jet to create a suction drawlng a1r from a part of said second kilnportion less'closely adjacent the exit end of the kiln.

Signed at Cleveland in the county of Cuyahoga and State of Ohio-this 23rd day CONRAD nn'nssrna. 

